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Free keywords:
Gadolinium alloys, Ab initio band structure, Band structure analysis, Electronic band, G factors, In-field, Model Hamiltonians, Observation wells, Reflectivity spectra, Triple points, Zeeman splittings, Infrared spectroscopy
Abstract:
We measured the magneto-reflectivity spectra (4-90 meV, 0-16 T) of the triple-point semimetal GdPtBi and found them to demonstrate two unusual broad features emerging in field. The electronic bands of GdPtBi are expected to experience large exchange-mediated shifts, which lends itself to a description via effective Zeeman splittings with a large g factor. Based on this approach, along with an ab initio band structure analysis, we propose a model Hamiltonian that describes our observations well and allows us to estimate the effective g factor, g∗=95. We conclude that we directly observe the exchange-induced Γ8 band inversion in GdPtBi by means of infrared spectroscopy. © 2023 American Physical Society.
